Class 10 Science Chemical Reactions and Equations MCQs Online Test

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Chemical Reactions and Equations is one of the most important science chapters in class 10. We have Chemical Reactions and Equations class 10 multiple-choice questions available online to help you get better at science. Experts in the field have produced these Class 10 Chemical Reactions and Equations Multiple Choice Questions. Students can have a better understanding of complex science ideas by using Chemical Reactions and Equations Class 10 Multiple Choice Questions. We’ve taken the effort to offer something special that can make science enjoyable. Practice the science multiple-choice questions that we have provided on our website with enjoyment.

The MCQ for class 10 Chemical Reactions and Equations was created using the most recent science curriculum from CBSE. You should practice Class 10 Chemical Reactions and Equations MCQ on a regular basis to ensure that you receive high exam scores.

We have created class 10 Chemical Reactions and Equations multiple-choice questions (MCQs) to assist you in your preparation since success in science requires consistent practice.

Class 10 Science Chemical Reactions and Equations MCQs Online Test

Class 10 Science Chemical Reactions and Equations online MCQs Mock Test 1

1 / 20

Q1. Which of the following is not a physical change?

Melting of ice to give water

Combustion of Liquefied Petroleum Gas (LPG)

Boiling of water to give water vapour

Dissolution of salt in water

2 / 20

Q2. The following reaction is an example of a
4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₃O(g)
(i) displacement reaction
(ii) combination reaction
(iii) redox reaction
(iv) neutralisation reaction

i and iii

iii and iv

ii and iii

i and iv

3 / 20

Q3. Which of the following statements about the given reaction are correct?
3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent

(iii) and (iv)

(i), (ii) and (iii)

(i), (ii) and (iv)

(ii) and (iv)

4 / 20

Q4. Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

(i) and (ii)

5 / 20

Q5. Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous
CuSO₄ and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in
the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the
solution falls. Which one of the following statement(s) is(are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.

(ii) only

(i) only

(i) and (iv)

(ii) and (iii)

6 / 20

Q6. Which among the following is(are) double displacement reaction(s)?
(i) Pb + CuCl₂ → PbCl₂ + Cu
(ii) Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl
(iii) C + O₂ → CO₂
(iv) CH₄ + 2O₂ → CO₂ + 2H₂O

(ii) only

(i) and (ii)

(i) and (iv)

(iii) and (iv)

7 / 20

Q7. Which among the following statement(s) is(are) true? Exposure of
silver chloride to sunlight for a long duration turns grey due to
(i) the formation of silver by decomposition of silver chloride
(ii) sublimation of silver chloride
(iii) decomposition of chlorine gas from silver chloride
(iv) oxidation of silver chloride

(iv) only

(i) and (iii)

(ii) and (iii)

(i) only

8 / 20

Q8. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following
correctly represents the type of the reaction involved?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction

(iv) only

(i) only

(ii) only

(ii) and (iv)

9 / 20

Q9. Electrolysis of water is a decomposition reaction. The mole ratio of
hydrogen and oxygen gases liberated during electrolysis of water is

4:1

1:2

2:1

1:1

10 / 20

Q10. Which of the following is(are) an endothermic process(es)?
(i) Dilution of sulphuric acid
(ii) Sublimation of dry ice
(iii) Condensation of water vapours
(iv) Evaporation of water

(ii) and (iv)

(i) and (iii)

(iii) only

(ii) only

11 / 20

Q11. Which of the statements about the reaction below are incorrect?
2PbO(s) + C(s) → 2Pb(s) + CO₂ (g)
(a) Lead is getting reduced.
(b) Carbon dioxide is getting oxidised.
(c) Carbon is getting oxidised.
(d) Lead oxide is getting reduced.

All

a and b

a, b and c

a and c

12 / 20

Q12. Fe₂O₃ + 2Al → Al₂O₃ + 2Fe
The above reaction is an example of a

decomposition reaction

displacement reaction

double displacement reaction

combination reaction

13 / 20

Q13. What happens when dilute hydrochloric acid is added to iron fillings? Tick the
correct answer.

Iron salt and water are produced

Hydrogen gas and iron chloride are produced

Chlorine gas and iron hydroxide are produced

No reaction takes place

14 / 20

Q14. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved
at reaction temperature?

2H₂ (g) + O₂ (g) → 2H₂O(l)

2H₂ (l) + O₂ (l) → 2H₂O(g)

2H₂ (g) + O₂ (l) → 2H₂O(l)

2H₂ (g) + O₂ (g) → 2H₂O(g)

15 / 20

Q15. Which of the following are combination reactions?

(ii) and (iii)

(ii) and (iv)

(i) and (iii)

(iii) and (iv)

16 / 20

Q16. Which one of the following processes involve chemical reactions?

Keeping petrol in a china dish in the open

Liquefaction of air

Heating copper wire in presence of air at high temperature

Storing of oxygen gas under pressure in a gas cylinder

17 / 20

Q17. The following reaction is used for the preparation of oxygen gas in the laboratory
Which of the following statement(s) is(are) correct about the reaction?

It is a decomposition reaction and endothermic in nature

It is a combination reaction

It is a decomposition reaction and accompanied by release of heat

It is a photochemical decomposition reaction and exothermic in nature

18 / 20

Q18. Which of the following gases can be used for storage of fresh sample of an oil for a long time?

Carbon dioxide or oxygen

Helium or nitrogen

Carbon dioxide or helium

Nitrogen or oxygen

19 / 20

Q19. In the double displacement reaction between aqueous potassium
iodide and aqueous lead nitrate, a yellow precipitate of lead iodide
is formed. While performing the activity if lead nitrate is not
available, which of the following can be used in place of lead
nitrate?

Ammonium nitrate

Potassium sulphate

Lead sulphate (insoluble)

Lead acetate

20 / 20

Q20. Solid calcium oxide reacts vigorously with water to form calcium
hydroxide accompanied by liberation of heat. This process is
called slaking of lime. Calcium hydroxide dissolves in water to
form its solution called lime water. Which among the following is
(are) true about slaking of lime and the solution formed?
(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

(i) and (ii)

(ii) and (iii)

(i) and (iv)

(iii) and (iv)

Your score is

The average score is 38%

Class 10 Science Chemical Reactions and Equations MCQs Online Test

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